Fix SkTime::GetDateTime Posix implementation, add unit test.

Fix SkTime::GetDateTime Posix implementation, add unit test.

The year was off by 1900

Committed: https://skia.googlesource.com/skia/+/8e74b1565c5573a0be40060cebbc112fc156f26d

[hal.canary, 2014-11-10 14:36:12]

halcanary@google.com changed reviewers:
+ caryclark@google.com

[hal.canary, 2014-11-10 14:36:13]

PTAL

[caryclark, 2014-11-10 14:52:34]

On 2014/11/10 14:36:13, Hal Canary wrote:
> PTAL

Could you run the trybots to exercise the test on Windows and Mac if you have
not already locally done so? Also, please limit the year check in the test to
the next 50 years (I'll be dead by then) in case other platforms have bugs
around this.

[hal.canary, 2014-11-10 14:56:08]

The CQ bit was checked by halcanary@google.com

[commit-bot: I haz the power, 2014-11-10 14:57:12]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/714633002/20001

[commit-bot: I haz the power, 2014-11-10 14:57:13]

Note for Reviewers:
The CQ is waiting for an approval.
If you believe that the CL is not ready yet, or if you would like to L-G-T-M
with comments then please uncheck the CQ checkbox.

Waiting for LGTM from valid reviewer(s) till 2014-11-10 20:57 UTC

[hal.canary, 2014-11-10 14:57:36]

The CQ bit was unchecked by halcanary@google.com

[hal.canary, 2014-11-10 15:01:57]

Patchset #1 (id:1) has been deleted

[caryclark, 2014-11-10 17:00:27]

lgtm

[hal.canary, 2014-11-10 17:12:29]

The CQ bit was checked by halcanary@google.com

[commit-bot: I haz the power, 2014-11-10 17:13:07]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/714633002/40001

[commit-bot: I haz the power, 2014-11-10 17:20:25]

Committed patchset #2 (id:40001) as
https://skia.googlesource.com/skia/+/8e74b1565c5573a0be40060cebbc112fc156f26d